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Note 7 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 62,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 7.88  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 20,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,000  
Employee Stock Option [Member]    
Allocated Share-based Compensation Expense, Total 0 $ 0
Restricted Stock [Member]    
Allocated Share-based Compensation Expense, Total 2,900 2,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 5,600  
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Performance Shares [Member]    
Allocated Share-based Compensation Expense, Total $ 6,300 $ 2,400
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 5,900  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Shares Issued During Exercise of Instrument, Upper Limit, Percentage 200.00%  
Performance Shares [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Performance Shares [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Restricted and Performance Shares [Member]    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 1,800